Note to the half-life in the disinfection tank
Louise Wipfler, d.d. February 2016.
The half-life in the disinfection tank of the soilless system is currently restricted between 0.1 d and 106 d.
These limits are set in SPIN2.2. Users requested to enable the calculation of PECs for substances with
lower half-lives. We are currently working on a new version of SPIN, that allows for pesticides with halflives in the disinfections tank lower than 0.1 d. The release of this version of SPIN is planned for mid2016.
A new version of the Substance Emission Model (the greenhouse fate-model) was taken up in GEM2.2.2
which is able to calculate concentrations in emission water for a half-life in the disinfection tank between
10-5 d and 106 d. After the new version of SPIN is released, GEM2.2.2 may be coupled to the new SPIN.
Then, GEM2.2.2 can be run also for substances with lower values of the half-life in the disinfection tank
then 0.1 d
In the short term we recommend to use a work-around:
Step 1: run an assessment for the substance of interest, but with a value of the half-life in the
disinfection tank of 0.1 d
Step 2: go to the directory of this run. This directory can be found in lower corner of the status-tab of
the assessment:
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Step 3: open the .inp file in the substance directory. In the example this would be:
D:\UserData\GEM2\Projects\6\7\SUBSTANCE\7.inp and change the value of DT50RefDinf_[substance
name] into the required value (see figure below).
Step 4: Re-run the substance emission model outside the user interface by clicking the run_...bat file in
the same directory.
Step 5: copy the outfile: *.g2t to the TOXSWA directory ( in the example to:
D:\UserData\GEM2\Projects\6\7\TOXSWA\.. ) and use the run_...bat file in this folder to run TOXSWA.
Step 6: The results of the calculation can be found in the *.sum output file created by TOXSWA.
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